perf thread-stack: Avoid direct reference to the thread's stack
In preparation for fixing thread stack processing for the idle task, avoid direct reference to the thread's stack. The thread stack will change to an array of thread stacks, at which point the meaning of the direct reference will change. Signed-off-by: NAdrian Hunter <adrian.hunter@intel.com> Acked-by: NJiri Olsa <jolsa@kernel.org> Link: http://lkml.kernel.org/r/20181221120620.9659-4-adrian.hunter@intel.com [ Rename thread_stack__ts() to thread__stack() since this operates on a 'thread' struct ] Signed-off-by: NArnaldo Carvalho de Melo <acme@redhat.com>
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